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SubjectRe: [PATCH 3/3] can: esd_usb: Improved decoding for ESD_EV_CAN_ERROR_EXT messages
On Tue. 20 Dec. 2022 at 14:27, Vincent MAILHOL
<mailhol.vincent@wanadoo.fr> wrote:
> Le mar. 20 déc. 2022 à 06:28, Frank Jungclaus <frank.jungclaus@esd.eu> a écrit :
> > As suggested by Marc there now is a union plus a struct ev_can_err_ext
> > for easier decoding of an ESD_EV_CAN_ERROR_EXT event message (which
> > simply is a rx_msg with some dedicated data).
> >
> > Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de>
> > Link: https://lore.kernel.org/linux-can/20220621071152.ggyhrr5sbzvwpkpx@pengutronix.de/
> > Signed-off-by: Frank Jungclaus <frank.jungclaus@esd.eu>
> > ---
> > drivers/net/can/usb/esd_usb.c | 18 +++++++++++++-----
> > 1 file changed, 13 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/net/can/usb/esd_usb.c b/drivers/net/can/usb/esd_usb.c
> > index 09745751f168..f90bb2c0ba15 100644
> > --- a/drivers/net/can/usb/esd_usb.c
> > +++ b/drivers/net/can/usb/esd_usb.c
> > @@ -127,7 +127,15 @@ struct rx_msg {
> > u8 dlc;
> > __le32 ts;
> > __le32 id; /* upper 3 bits contain flags */
> > - u8 data[8];
> > + union {
> > + u8 data[8];
> > + struct {
> > + u8 status; /* CAN Controller Status */
> > + u8 ecc; /* Error Capture Register */
> > + u8 rec; /* RX Error Counter */
> > + u8 tec; /* TX Error Counter */
> > + } ev_can_err_ext; /* For ESD_EV_CAN_ERROR_EXT */
> > + };
> > };
> >
> > struct tx_msg {
> > @@ -229,10 +237,10 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv,
> > u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
> >
> > if (id == ESD_EV_CAN_ERROR_EXT) {
> > - u8 state = msg->msg.rx.data[0];
> > - u8 ecc = msg->msg.rx.data[1];
> > - u8 rxerr = msg->msg.rx.data[2];
> > - u8 txerr = msg->msg.rx.data[3];
> > + u8 state = msg->msg.rx.ev_can_err_ext.status;
> > + u8 ecc = msg->msg.rx.ev_can_err_ext.ecc;
> > + u8 rxerr = msg->msg.rx.ev_can_err_ext.rec;
> > + u8 txerr = msg->msg.rx.ev_can_err_ext.tec;
>
> I do not like how you have to write msg->msg.rx.something. I think it
> would be better to make the union within struct esd_usb_msg anonymous:
>
> https://elixir.bootlin.com/linux/latest/source/drivers/net/can/usb/esd_usb.c#L169

Or maybe just declare esd_usb_msg as an union instead of a struct:

union esd_usb_msg {
struct header_msg hdr;
struct version_msg version;
struct version_reply_msg version_reply;
struct rx_msg rx;
struct tx_msg tx;
struct tx_done_msg txdone;
struct set_baudrate_msg setbaud;
struct id_filter_msg filter;
};

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